Ex-Tropical Cyclone Owen produced a massive 681mm of rain in the small town of Halifax in North Queensland to 9am this morning. Nearby locations received a drenching with Gairloch recording 452mm and Lucinda 390mm. The 681mm in Halifax makes it the wettest day on record, this includes combining the old site records for rainfall which date back to 1900! The previous record was 476mm in 24 hours back on January 16, 1991. Heavy falls of 100-200mm have occurred well into the Townsville region also. Ex-Tropical Cyclones are notorious for generating massive amounts of rain in a short period of time as often they have convergence zones that concentrate the heaviest shower and storm activity to a single focus point or line.
As a comparison, Melbourne’s average annual rainfall for 12 months is 648mm which is less than the amount of rain that fell in Halifax in just 24 hours!
Further very heavy falls are likely to extend south today as Ex-Tropical Cyclone Owen slowly drifts southeast and may sit off or near the Mackay region by tomorrow.